Image Upscaler
Upscale images 2x or 4x in your browser with high-quality resampling and a sharpening pass. Free, private, no signup — download as PNG or JPG.
About the Image Upscaler
This free image upscaler enlarges any photo or graphic to 2x or 4x its original size directly in your browser. It uses the highest-quality resampling your browser offers (bicubic-style smoothing) followed by an adjustable unsharp-mask sharpening pass, so the enlarged image stays crisp instead of turning soft and blurry.
To be clear about what you get: this is high-quality browser upscaling with sharpening — not an AI model. It cannot invent detail that was never captured, but for most everyday jobs (printing, presentations, meeting a platform's minimum resolution, enlarging logos and screenshots) the results are excellent and instant.
Everything runs locally on your device — the image is never uploaded to a server, there is no signup, and there is no watermark. Output is capped at 8000 pixels on the longest side to keep browsers stable, and you can download the result as lossless PNG or a smaller JPG.
How to Use the Image Upscaler
- 1Upload the image you want to enlarge.
- 2Choose 2x or 4x — the exact output dimensions are shown before you start.
- 3Adjust the sharpening slider if you want a crisper or softer result.
- 4Click Upscale, compare before and after, and download as PNG or JPG.
Frequently Asked Questions
Is this an AI image upscaler?
No — and we say so honestly. It uses high-quality browser resampling plus an unsharp-mask sharpening filter. AI upscalers can hallucinate new detail; this tool faithfully enlarges what is already in your image, which is often exactly what you want for logos, screenshots and documents.
Will the upscaled image look better than the original?
It will be larger and, thanks to the sharpening pass, crisper than a naive resize — but it cannot add detail that was never in the photo. A very small or heavily compressed image will still show its limitations at 4x.
What is the maximum output size?
8000 pixels on the longest side. Beyond that most browsers run out of canvas memory. If your image would exceed the cap at 4x, try 2x instead — the tool warns you before processing.
Is my image uploaded anywhere?
No. The entire upscale, including the sharpening convolution, runs in your browser with the canvas API. Your image never leaves your device.
Should I download PNG or JPG?
PNG is lossless and best for graphics, logos and text. JPG is much smaller and fine for photos. If your original had transparency, choose PNG — JPG flattens it onto white.